WSP13020 (2) - Laserfiche WebLink

Home Browse Search

Two reservoir capacities are being considered (Figure 9). The first, a 60,200 acre-foot reservoir capacity, is the maximum capacity that could be built at the site. It would have a dam height of300 feet and require relocation of Highway 93 and realignment of the Denver & Rio Grande Railroad along the northern edge of the reservoir. The second, a 31,300 acre-foot reservoir, would have a dam height of 150 feet, but would not require relocation of the D&RGW Railroad or Highway 93. Leyden Gulch Reservoir could be filled through increased diversions of Denver Water's water rights in the Fraser and Williams Fork rivers and in South Boulder Creek primarily during the spring runoff months of wet and average years, Examples of potential environmental issues associated with the Leyden Gulch alternatives include: · On-site impacts associated with the construction of the dam and inundation area of the reservoir. · Potential suitable habitat for the federally listed endangered Preble's meadow jumping mouse, and the federally listed Colorado butterfly plant and Ute-ladies' tresses, Surveys that have been conducted for all three of these species on the property have not indicated presence of the species, · Aquatic resources in the Fraser and Williams Fork basins including wetlands, fisheries, water quality and endangered species that may be affected by increased diversions in the Fraser and Williams Fork rivers. · Aquatic resources including wetlands, fisheries, water quality and endangered species resulting from increased flows in South Boulder Creek between Moffat Tunnel and Gross Reservoir, increased flows between Gross Reservoir and the South Boulder Diversion, and decreased flows downstream on South Boulder Creek below South Boulder Diversion. · Resources affected by changes in hydrology in other parts of Denver Water's Collection System from operation of Leyden Reservoir. · The potential relocation ofthe historic D&RG Railroad. · The potential realignment of Highway 93. · A black-tailed prairie dog community within the inundation zone. Potable Recycling An important source of water available to Denver Water is reusable effiuent. This supply is available at the Bi-City, Glendale, and Metro wastewater treatment plants. Denver Water uses its reusable effiuent through exchanges and through the non-potable recycling project. These uses capture most of the reusable effiuent presently available during the summer months, However, on average there is approximately 15,000 acre-feet of reusable effiuent remaining that could be used in a potable recycling project. This supply varies significantly from year to year and is primarily available during the winter months. 22 C:\Documents and Settings\vyp\Local Settings\TempofllI)' Internet Files\OLK 1 SO\MoffatSystem 1 00603 .doc